It's a death spiral - people have something to post, but go to more populated forums as they're more likely to get a reply.
With forums, people attract people and sadly sidc have culled off non-members limiting the number of people. Just look at some of the dates for recent posts.
I know the chap, mark, who used to organise the East Anglia stuff on here wasn't a member and obviously now doesn't come on here. He now sorts stuff on ScoobyNet and pistonheads.
Sad really.